Cannot use plantuml with latex error

[giuli635]

• Configuration header:

diagram:
  engine:
    plantuml:
      mime-types:
        application/pdf: false
        image/png: true

• Command: pandoc -L $PATH_OF_DIAGRAM -o summary.pdf summary.md
• Content:

@startuml
class Nombre{
    Atributos
    __
    Operaciones
    --
    Responsabilidades
}
@enduml

• Return: Cannot use plantuml with latex
• Expected: use svg to render plantuml

[tarleb]

Thanks for the report. So far I wasn't able to reproduce this. The following runs without error.

pandoc -L diagram.lua test.md -o out.pdf

where test.md is

---
title: Look at this nice and meaningless title
diagram:
  engine:
    plantuml:
      mime-types:
        application/pdf: false
        image/png: true
---

``` plantuml
@startuml
class Nombre{
    Atributos
    __
    Operaciones
    --
    Responsabilidades
}
@enduml
```

Please provide more details, ideally with a reproducible example.

[giuli635]

Sorry, it should be image/png: false. I forgot to change it, that's my "workaround".

[tarleb]

Ah, I see. LaTeX doesn't work with SVG AFAIK, and these images first have to be converted to a different format first. So the filter is working as intended.

What's the reason that you'd prefer SVG for this?

[giuli635]

Because I don't have plantuml support for PDF, it's really annoying to setup, and PNG most of the time renders in low resolution, and I suppose LaTeX scales it a little bit, so the result it's pretty bad

[tarleb]

That makes sense. Let me check the code to see if there's an easy solution to this.

Do you have Inkscape or librsvg installed? We'll still need to convert the SVG to something that LaTeX can handle.

[giuli635]

I have librsvg installed

[tarleb]

I'm working on a better solution, but for the time being, you can use a little hack: It's a filter that wraps the diagram filter, pretending that the conversion is targeting HTML.

local diagram_filter = 'diagram.lua'
function Pandoc (doc)
  -- Copy the global environment, but set a different target FORMAT
  local env = {}
  for key, value in pairs(_G) do
    env[key] = value
  end
  env.FORMAT = 'html'

  -- Call the diagram filter, pretending that we're converting to HTML
  return pandoc.utils.run_lua_filter(doc, diagram_filter, env)
end

Use it instead of the plain diagram.lua filter.
I didn't test, but I suspect that the result will be the same as using PNG right away.

---

I'm not sure yet what the proper fix could look like. The most reasonable thing would probably be to make format options configurable, e.g.

diagram:
  format:
    latex:
      mime-types: ['image/png', 'image/svg+xml']

[giuli635]

Hello! I'm going to try this as soon as possible, thank you for the fast response, you've been very helpful.

[giuli635]

Well, I've tried the workaround quite a bit later hahaha. But I get the following message:
[WARNING] Scripting warning at /home/giuliano/.local/opt/diagram/diagram.lua line 310 column 1: /home/giuliano/.local/opt/diagram/diagram_wrapper.lua: Cannot use plantuml with html